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It is not as though the rare-earth elements-scandium, yttrium and lanthanum plus the 14 so-called lanthanides-are all that rare.
并非所有稀土元素都像钪、钇、镧加上14所谓的镧系元素那样稀少。
It suggests that rare-earth elements yttrium and praseodymium have certain genotoxicity.
提示稀土元素钇和镨具有一定的遗传毒性。
Yttrium serves as an ideal non - magnetic diluent for the rare - earth metals.
钇被用作稀土金属一种理想的非磁性稀释剂。
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